Magnesite brick for saving energy under high-temperature environment based on thermal-barrier and thermal-radiation complex function and preparation process of magnesite brick

The invention relates to a magnesite brick for saving energy under high-temperature environment based on a thermal-barrier and thermal-radiation complex function and belongs to the field of refractory materials in subject of inorganic non-metallic materials. The energy-saving magnesite brick is prepared by mixing, grinding, pressing and sintering 98 electro-fused magnesia, mesoporous magnesium oxide, lanthanum chromate, samarium chromate, neodymium chromate, strontium lanthanum manganite, lanthanum oxide, chromium oxide, magnesium carbonate, carbon black and molybdenum silicide as raw materials, pulp waste as a binding agent and an added surfactant obtained by mixing sulfonated naphthaldehyde polymer and polycarboxylic acid. The energy-saving magnesite brick has the advantages of low heat conductivity coefficient, high thermal emissivity and significant thermal-barrier and thermal-radiation function, when the magnesite brick is applied in thermal equipment which operates in the high-temperature environment of 800 DEG C-1600 DEG C, the energy-saving effect is 12-15% and the energy-saving effect can reach above 15% in a thermal kiln furnace of which the temperature is above 1700 DEG C.